// SPDX-License-Identifier: GPL-2.0+ /* * Copyright (C) 2011 Texas Instruments * Copyright (c) 2024 Svyatoslav Ryhel */ #define LOG_CATEGORY UCLASS_PANEL_BACKLIGHT #include #include #include #include #include #include #include #include #include #include #define LP855x_MIN_BRIGHTNESS 0x00 #define LP855x_MAX_BRIGHTNESS 0xff /* LP8550/1/2/3/6 Registers */ #define LP855X_BRIGHTNESS_CTRL 0x00 #define LP855X_DEVICE_CTRL 0x01 #define LP855X_EEPROM_START 0xa0 #define LP855X_EEPROM_END 0xa7 #define LP8556_EPROM_START 0x98 #define LP8556_EPROM_END 0xaf /* LP8555/7 Registers */ #define LP8557_BL_CMD 0x00 #define LP8557_BL_MASK 0x01 #define LP8557_BL_ON 0x01 #define LP8557_BL_OFF 0x00 #define LP8557_BRIGHTNESS_CTRL 0x04 #define LP8557_CONFIG 0x10 #define LP8555_EPROM_START 0x10 #define LP8555_EPROM_END 0x7a #define LP8557_EPROM_START 0x10 #define LP8557_EPROM_END 0x1e struct lp855x_rom_data { u8 addr; u8 val; }; struct lp855x_backlight_priv; /* * struct lp855x_device_config * @pre_init_device: init device function call before updating the brightness * @reg_brightness: register address for brigthenss control * @reg_devicectrl: register address for device control * @post_init_device: late init device function call */ struct lp855x_device_config { int (*pre_init_device)(struct udevice *dev); u8 reg_brightness; u8 reg_devicectrl; u8 reg_eepromstart; u8 reg_eepromend; int (*post_init_device)(struct udevice *dev); }; struct lp855x_backlight_priv { struct udevice *supply; /* regulator for VDD input */ struct udevice *enable; /* regulator for EN/VDDIO input */ u8 device_control; u8 initial_brightness; int size_program; struct lp855x_rom_data *rom_data; struct lp855x_device_config *cfg; }; static int lp855x_backlight_enable(struct udevice *dev) { struct lp855x_backlight_priv *priv = dev_get_priv(dev); int ret; ret = regulator_set_enable_if_allowed(priv->supply, 1); if (ret) { log_debug("%s: enabling power-supply failed (%d)\n", __func__, ret); return ret; } ret = regulator_set_enable_if_allowed(priv->enable, 1); if (ret) { log_debug("%s: enabling enable-supply failed (%d)\n", __func__, ret); return ret; } mdelay(2); if (priv->cfg->pre_init_device) { ret = priv->cfg->pre_init_device(dev); if (ret) { log_debug("%s: pre init device err: %d\n", __func__, ret); return ret; } } ret = dm_i2c_reg_write(dev, priv->cfg->reg_brightness, priv->initial_brightness); if (ret) return ret; ret = dm_i2c_reg_write(dev, priv->cfg->reg_devicectrl, priv->device_control); if (ret) return ret; if (priv->size_program > 0) { int i; u8 val, addr; for (i = 0; i < priv->size_program; i++) { addr = priv->rom_data[i].addr; val = priv->rom_data[i].val; if (addr < priv->cfg->reg_eepromstart && addr > priv->cfg->reg_eepromend) continue; ret = dm_i2c_reg_write(dev, addr, val); if (ret) return ret; } } if (priv->cfg->post_init_device) { ret = priv->cfg->post_init_device(dev); if (ret) { log_debug("%s: post init device err: %d\n", __func__, ret); return ret; } } return 0; } static int lp855x_backlight_set_brightness(struct udevice *dev, int percent) { struct lp855x_backlight_priv *priv = dev_get_priv(dev); if (percent == BACKLIGHT_DEFAULT) percent = priv->initial_brightness; if (percent < LP855x_MIN_BRIGHTNESS) percent = LP855x_MIN_BRIGHTNESS; if (percent > LP855x_MAX_BRIGHTNESS) percent = LP855x_MAX_BRIGHTNESS; /* Set brightness level */ return dm_i2c_reg_write(dev, priv->cfg->reg_brightness, percent); } static int lp855x_backlight_probe(struct udevice *dev) { struct lp855x_backlight_priv *priv = dev_get_priv(dev); int rom_length, ret; if (device_get_uclass_id(dev->parent) != UCLASS_I2C) return -EPROTONOSUPPORT; priv->cfg = (struct lp855x_device_config *)dev_get_driver_data(dev); dev_read_u8(dev, "dev-ctrl", &priv->device_control); dev_read_u8(dev, "init-brt", &priv->initial_brightness); /* Fill ROM platform data if defined */ rom_length = dev_get_child_count(dev); if (rom_length > 0) { struct lp855x_rom_data *rom; ofnode child; int i = 0; rom = devm_kcalloc(dev, rom_length, sizeof(*rom), GFP_KERNEL); if (!rom) return -ENOMEM; dev_for_each_subnode(child, dev) { ofnode_read_u8(child, "rom-addr", &rom[i].addr); ofnode_read_u8(child, "rom-val", &rom[i].val); i++; } priv->size_program = rom_length; priv->rom_data = &rom[0]; } ret = uclass_get_device_by_phandle(UCLASS_REGULATOR, dev, "power-supply", &priv->supply); if (ret) { log_err("%s: cannot get power-supply: ret = %d\n", __func__, ret); return ret; } ret = uclass_get_device_by_phandle(UCLASS_REGULATOR, dev, "enable-supply", &priv->enable); if (ret) { log_err("%s: cannot get enable-supply: ret = %d\n", __func__, ret); return ret; } return 0; } static const struct backlight_ops lp855x_backlight_ops = { .enable = lp855x_backlight_enable, .set_brightness = lp855x_backlight_set_brightness, }; static int lp8556_bl_rst(struct udevice *dev) { int ret; /* Reset backlight after updating EPROM settings */ ret = dm_i2c_reg_clrset(dev, LP855X_DEVICE_CTRL, LP8557_BL_MASK, LP8557_BL_OFF); if (ret) return ret; mdelay(10); return dm_i2c_reg_clrset(dev, LP855X_DEVICE_CTRL, LP8557_BL_MASK, LP8557_BL_ON); } static int lp8557_bl_off(struct udevice *dev) { /* BL_ON = 0 before updating EPROM settings */ return dm_i2c_reg_clrset(dev, LP8557_BL_CMD, LP8557_BL_MASK, LP8557_BL_OFF); } static int lp8557_bl_on(struct udevice *dev) { /* BL_ON = 1 after updating EPROM settings */ return dm_i2c_reg_clrset(dev, LP8557_BL_CMD, LP8557_BL_MASK, LP8557_BL_ON); } static struct lp855x_device_config lp855x_dev_cfg = { .reg_brightness = LP855X_BRIGHTNESS_CTRL, .reg_devicectrl = LP855X_DEVICE_CTRL, .reg_eepromstart = LP855X_EEPROM_START, .reg_eepromend = LP855X_EEPROM_END, }; static struct lp855x_device_config lp8555_dev_cfg = { .reg_brightness = LP8557_BRIGHTNESS_CTRL, .reg_devicectrl = LP8557_CONFIG, .reg_eepromstart = LP8555_EPROM_START, .reg_eepromend = LP8555_EPROM_END, .pre_init_device = lp8557_bl_off, .post_init_device = lp8557_bl_on, }; static struct lp855x_device_config lp8556_dev_cfg = { .reg_brightness = LP855X_BRIGHTNESS_CTRL, .reg_devicectrl = LP855X_DEVICE_CTRL, .reg_eepromstart = LP8556_EPROM_START, .reg_eepromend = LP8556_EPROM_END, .post_init_device = lp8556_bl_rst, }; static struct lp855x_device_config lp8557_dev_cfg = { .reg_brightness = LP8557_BRIGHTNESS_CTRL, .reg_devicectrl = LP8557_CONFIG, .reg_eepromstart = LP8557_EPROM_START, .reg_eepromend = LP8557_EPROM_END, .pre_init_device = lp8557_bl_off, .post_init_device = lp8557_bl_on, }; static const struct udevice_id lp855x_backlight_ids[] = { { .compatible = "ti,lp8550", .data = (ulong)&lp855x_dev_cfg }, { .compatible = "ti,lp8551", .data = (ulong)&lp855x_dev_cfg }, { .compatible = "ti,lp8552", .data = (ulong)&lp855x_dev_cfg }, { .compatible = "ti,lp8553", .data = (ulong)&lp855x_dev_cfg }, { .compatible = "ti,lp8555", .data = (ulong)&lp8555_dev_cfg }, { .compatible = "ti,lp8556", .data = (ulong)&lp8556_dev_cfg }, { .compatible = "ti,lp8557", .data = (ulong)&lp8557_dev_cfg }, { } }; U_BOOT_DRIVER(lp855x_backlight) = { .name = "lp855x_backlight", .id = UCLASS_PANEL_BACKLIGHT, .of_match = lp855x_backlight_ids, .probe = lp855x_backlight_probe, .ops = &lp855x_backlight_ops, .priv_auto = sizeof(struct lp855x_backlight_priv), };